Exhaust-heater for compound motors.



No. 773,657. EATENTED NOV. 1, 1904.

T. G. E. LINDMAEK.

EXHAUST HEATER PoE EOMPOUND MOTORS.

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.E @l E JI Pfl APPLICATION PI ED JAN.16,

HNI fnv.

ATTOR EY PATENTED NOV. l, 1904.

T. G. E. LINDMARK. EXHAUST HEATER FOR OOMPOUND MOTORS.

APPLICATION FILED JAN.16, 1903.

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N0 MODEL.

WITNESSES:

INVENTR "{V ATTORNEY Si.hvrrnn STATES Patented November 1.I 1904.

PATENT Trice.

TORE GUSTAF EMANUFJL LINDMARK, OF STOCKHOLM, SWEDEN.

SPECIFICATION forming part of Letters Patent No. 773,657', datedNovember 1, 1904. Application led January 16, 1903. Serial No. 139,262.(No model.)

To @ZZ whom t may concern:

Be it known that I, ToRn GUsTAF EMANUEL LINDMARK, a subject of the Kingof Sweden and Norway, and a resident of Stockholm, Sweden, have inventeda new and useful Improvement in Exhaust-Heaters for CompoundElastic-Fluid Motors, of which the following is a specification.

The invention relates to elastic-fluid motors wherein the iuid undergoesprogressive expansion, and more particularly to turbines.

The invention consists in the combination, with a plurality of saidmotors, of means for superheating the Huid, so as toincrease the degreeof superheating prior to each expansion or prior to certain number ofexpansions, and also in the construction hereinafter set forth, and moreparticularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a longitudinal section of. amultiple steamturbine provided with my heating' apparatus and feed-waterheater. Fig. 2 is a partial cross-section on the line a a of Fig. 1.

Similar characters of reference indicate like parts.

The wheel-shaft 1 is supported in bearings 2 3 in standards 4 andprovided with the pulley On said shaft are the wheel-hubs 6 7 8 9, eachhub being anged, as shown at 10 11 12 13, so that said ianges each forma wheel-head. r1`he opposite 'wheel-heads 14 15 16 17 are flanged, asshown at 18 19 2() 21, to form annular steam-inlets 22 23 24 25 to theinterior of the wheels. Between the heads of each wheel are the inclinedbuckets 26. The wheel-casing 27 incloses the wheels and has annularpartitions 28 29 30 31 32 33 34, which extend radially upward to meetthe flanges 18 19 2O 21, and also shoulders formed upon the hub-flanges10 11 12 13.

The wheel-hub 6 is iianged at 35 and is received in ,one head, 36, ofthe casing. The opposite casing-head, 37, receives the shoulderedportion of hub 9. Communicating with head 36 is the steam-inlet 38 andwith head 37 the exhaust-outlet 39. By reason of this construction thereis formed within the casing a chamber A, into which the steam firstenters, from which it passes through the inlet Vthe wheel-buckets theseveral wheels 22 to the ldrst wheel of the series, thence it escapesbetween the buckets 26 to the surrounding chamber B. The arrangement ofthe succeeding wheels and chambers is the samethat is, in advance of thesecond wheel there is a chamber C, from which the steam passes by theinlet 23 to said second wheel and then escapes into the surroundingchamber D, and so on. The chambers and wheel-passages of the successivewheels are, however, progressively larger to allow for the expansion ofthe steam as it proceeds from wheel to wheel, the final chambercommunicating with the exhaust-outlet 39. As the steam flows from areset in rotation.

I find that with a compound steam-turbine of this type it is desirableto superheat the steam between expansions, so that the degree ofsuperheating will increase from inlet to outlet. To effect this, Iprovide a duct or conduit E, through which hot gases are caused to passin the direction of the arrows b. Into this conduit project the U-shapedpipes F G H, the pipe F connecting the inclosing chamber B of the firstwheel with the receivingchamber C of the second wheel, the pipe Gconnecting the inclosing chamber D of the second Wheel with thesurrounding chamber of the third wheel, and the pipe H connecting theinclosing chamber of the third wheel with the surrounding chamber of thefourth wheel. Therefore the steam from chamber B passes through pipe Fbefore reaching chamber C, and so on, and in traversing each successivepipe the steam becomes superheated from the gases passing through theduct E. F G H are constructed of successively-larger diameter inproportion to the increased Volume of the expanded fluid. In order toaugment their heating-surface, they may be provided with projectingmetal flanges J K L. As the exhaust-steam escapes in ahighly-superheated state, itis desirable to utilize it, and therefore Iconnect the exhaust 39 with the feed-water heater shown at M. In thisdevice the feed-water enters at N, passes upward through the tubes O,and escapes at P. The su perheated steam passes through the casing Q,surrounding tubes O, and escapes at R.

The pipes IOO Vhile I have here shown an arrangement whereby the steamis superheated before every expansion, this is not essential, sincebetween some of the wheels of the compound series I may omit theconnecting-pipe. In that case the steam would be led directly from theinclosing chamber of one wheel to the receivingchamber of the nextwheel. Thus if the openings leading into pipe H were closed an openingat S (dotted lilies) would be used to conduct the steam from one chamberto the other.

I claiml. In combination with a plurality of elasticfiuid motors whereinsaid Huid undergoes progressive expansions, means for augmenting thetemperature of said Huid prior to each expansion by an amountprogressively increasing from the first expansion to the last.

2. In combination with a plurality of elasticfluid motors disposed inseries, means for augmenting the temperature of said fluid prior toentrance to each motor by an amount progressively increasing from thefirst admission to the last.

3. In combination with a plurality of elasticfluid turbines in whichsaid Huid is progressively expanded disposed in series, means interposedbetween successive turbines for augmenting' the temperature of theworking fluid by amounts progressively increasing from the initialadmission end of the series to the final exhaust.

4. In combination with aplurality of ela sticfluid motors wherein saidfluid undergoes progressive expansions, means for maintaining uniformthe temperature of saidfluid at the inlets of the several motors,substantially as described.

5. The combination of a plurality of elasticfluid turbine-wheels, ashaft supporting the same, a casing, partitions in said casing formingsuccessive chambers, conduits exterior to said casing and connectingsaid chambers in series, and means for heating said conduits,substantially as described.

6. The combination of a plurality of elasticfluid turbine-wheels, ashaft supporting the same, a casing, partitions in said casing formingsuccessive wheel-chambers, conduits exterior to sai'd casing andconnecting said chambers in series` and a duct for conveying heated gas;the said connecting-conduits extending into said duct, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

TORE GUSTAF EMANUEL LINDMARK.

Witnesses:

WALDEMAR BOMAN, F. EKEBOHM.

